Topic: Resize & Crop Images on the Fly?

So, finally I can extract the first thumbnail image from a blog post. The problem is that the image still in their original resolution:

<?php
    $str = $post['content'];
    $url = preg_match('<img.*?src="(.*?)".*? ?\/?>', $str, $output);
    if (!empty($output[1])) {
        echo "<img alt='' class='post-thumbnail' width='72' height='72' src='" . $output[1] . "'>";
    } else {
        echo "<img alt='' class='post-thumbnail' width='72' height='72' src='no-image.png'>";
    }
?>

Is it possible to resize and crop the image on the fly just like Picasa does, and also cache the result?

What is Image method used for?

Image::factory($file); // etc...
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